The Bloomberg administration stunned the city’s transportation establishment on Tuesday evening as reports trickled out about an ambitious plan to extend the No. 7 subway train under the Hudson River and into New Jersey.

Among the surprised: the Metropolitan Transportation Authority, which operates the city’s subways and found out about the proposal only hours before it was reported in the press.

The authority’s chairman, Jay H. Walder, said on Wednesday that his agency had not discussed the plan with the mayor’s office “prior to sometime yesterday afternoon.” And the authority’s top construction manager, who is overseeing the current expansion of the No. 7 to West 34th Street, said he read about the proposal in his morning newspaper.

In just a week, Bloomberg has gone from fearlessly independent to isolated and paranoid. Hey, Jared Kushner, please explain, because I don’t think anyone understands him anymore . . .